42205439387 has 4 divisors (see below), whose sum is σ = 43346126976. Its totient is φ = 41064751800.

The previous prime is 42205439281. The next prime is 42205439399. The reversal of 42205439387 is 78393450224.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 42205439387 - 2⁸ = 42205439131 is a prime.

It is a super-2 number, since 2×42205439387² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42205432387) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 570343739 + ... + 570343812.

It is an arithmetic number, because the mean of its divisors is an integer number (10836531744).

Almost surely, 2^42205439387 is an apocalyptic number.

42205439387 is a deficient number, since it is larger than the sum of its proper divisors (1140687589).

42205439387 is a wasteful number, since it uses less digits than its factorization.

42205439387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1140687588.

The product of its (nonzero) digits is 1451520, while the sum is 47.

The spelling of 42205439387 in words is "forty-two billion, two hundred five million, four hundred thirty-nine thousand, three hundred eighty-seven".